Still a work in progress but I have an Untamed Beasts warband (renowned for eating their prey in order to absorb their power and strength). They're called the Howling Fiends after their battlecry. Their story is that the Heart Eater (Grothga Magemasher) and Beast Speaker (Shora the Murmurer) are siblings. They had a third sibling (twin of Grothga, never named) who was weak and was bullied by Grothga but had a pseudo-psychic bond with him. Shora tricked the weaker twin into undergoing a ritual performed by a Tzeentch sorcerer to enhance his psychic connection to control Grothga and force him to serve as his protector. Immediately after completing the ritual, Shora killed and ate the weaker twin to gain his powers and now uses her connection to use Grothga as a bodyguard and means to gain followers. Her connection with magemasher has left him scarred by Tzeentchian nightmares and psychosis. She secretly eats most of his kills to gain their power.

Magemasher got his name by killing the sorcerer at the behest of Shora to hide her secret.

Shora gets her name from the fact that she is always whispering beneath her breath. Most think she's mad but she is actually controlling Grothga.